Refined viscous hydrocarbon oil



Patented Sept; 2, 1930 UNITED STATES PATENT oFFici:

THOMAS H. ROGERS, OF WHITING, INDIANA, ASSIGNOR TO STANDARD OIL GOIPANY,

OF WHITING, INDIANA, A CORPORATION OF INDIANA REFINED VISGOIIS HYDROCABBON OIL No Drawing.

compounds in which a. hydroxyl or amino group is attached to the ring. Thus pyrogallol, diphenylamine, gallic acid, dibutylrcsorcinol, betanaphthol and hydroquinone have been successfully employed for this purpose. Thus, in the case of a fuming acid treated white distillate oil of about 80 sec. Saybolt viscosity at 100 F. which, Without the addition of such a substance, increased in acidity from 0.01 to 25 mgm. KOH equivalent per gram of oil in 100 hours and marked- -ly decreased in demulsifiability, when oxygen was passed therethrough at a temperature of 100 (3., the same oil to which 0.04% pyrogallol had been added showed no increase in acidity and no decrease in demulsifiability under like conditions. The addition of 0.04 to 0.1% diphenylamine, of 0.002% gallic acid and of 0.05% dibutylresorcinol, under similar circumstances, prevented any but relatively slight changes in acidity and demulsifiability. Thus, the same 'oil containing 0.002% gallic acid showed an increase in acidity in 161 hours to only 2.5 mgm. KOH equivalent per am of oil.

The pro ortions of the aromatic compounds addhd may be varied considerably. In general 0.1% or less is suflic-ient to produce a marked result.

The oils prepared in accordance with the present invention have the property of retaining their resistivity to a high degree on aging.

I claim:

1. The method of preventing acid formation and increase of emulsifiability in use of so highly refined viscous hydrocarbon oils Application filed August 19, 1926. Serial No. ao,as1.

which comprises adding thereto a small proportion of an aromatic compound having a substituting group attached to the ring, said substituting group being of the class consisting of'the hydroiiyl and amino radicals.

2. The method of preventin acid formation and increase of emulsifiability in use of highly refined viscous hydrocarbon oils which comprises adding thereto up to 0.1%

of an amino-aromatic compound.

3. The method of preventing acid formation and increase of emulsifiabilit in use of highly refined viscous hydroc-ar on oils which comprises adding thereto a small quantity of an amino compound having a plurality of aromatic rings attached to the nitrogen atom.

4. The method of preventing acid formation and increase of emulsifiability in use of highly refined viscous hydrocarbon oils which comprises adding thereto 0.04 to 0.1% of diphenylamine.

5. A hi hly refined white viscous hydrocarbon oi free from asphaltic constituents and containing a small proportion of an aromatic compound having a substituting group attached to the ring, said substituting roup being of the class consisting of the hy roxyl and amino radicals.

6. A hi hly refined white viscous hydrocarbon oi free from asphaltic constituents and containing a small proportion of an amino-aromatic compound.

7. A highly refined white viscous hydrocarbon oil free from asphaltic constituents and containing a small quantity of an amino compound having a plurality of aromatic rings attached to the nitrogen atom.

8. A hi hly refined white viscous hydrocarbon oi free from asphaltic constituents and containing 0.04 to 1% of dippen lamine.

THOMAS H. O ERS. 

